We only use Syslog-ng where I work. We have a lot of servers that "log offsite" to a syslog analyzer so the logs can be sorted, stored, and alerts can be generated, etc. After using syslog-ng at work, I decided I couldn't live without it and set it up at home. It's really the best syslog tool I've worked with.

It should be noted that building syslog-ng requires libol which is available from the same people who write syslog-ng here. I've built libol and syslog-ng on x86 and x86-64 (both AMD and EM64T) with no problems what-so ever. It is intresting that libol is available under the GPL and not the LGPL....